#define _CRT_SECURE_NO_WARNINGS 1

class Solution
{
public:
    bool containsDuplicate(vector<int>& nums)
    {
        sort(nums.begin(), nums.end());
        int n = nums.size();
        for (int i = 0; i < n - 1; i++)
        {
            if (nums[i] == nums[i + 1]) {
                return true;
            }
        }

        return false;
    }
};